Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c7760670238db1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 10:41:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b5085471b74eef99d63a4c7ca3de52e8 SHA-1: 9b893fbff02861ae799d282258997d6cfa485c0d SHA-256: 97c7760670238db111118243040257fb3e591d69cf2ec0cb194ed59921ea4233
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains lures for 'free Robux' and 'game hacks', directing users to external URLs. It also exhibits characteristics of a PDF link farm, with numerous links to other PDF files hosted on the same domain. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/free-robux-no-human-verification-or-survey-or-download-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5207 28024 bytes
SHA-256: b431a58e0c757c111269e643dbf84a4d2f76c19e4842c9316dcc0909373d8801
font_01_sfnt_off00008f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 19736 bytes
SHA-256: 59e4374f8172b973ba9217c83b5ce6b26483f5ae1ceeffd331798f57e1658bad

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